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Full-Text Articles in Medicine and Health Sciences
Reduction And Recovery Of Self-Sustained Muscle Activity After Fatiguing Plantar Flexor Contractions, Anthony J. Blazevich, Ricardo N. O. Mesquita, Ronei S. Pinto, Timothy Pulverenti, Sébastien Ratel
Reduction And Recovery Of Self-Sustained Muscle Activity After Fatiguing Plantar Flexor Contractions, Anthony J. Blazevich, Ricardo N. O. Mesquita, Ronei S. Pinto, Timothy Pulverenti, Sébastien Ratel
Research outputs 2022 to 2026
Purpose: Persistent inward calcium and sodium currents (PICs) are crucial for initiation and maintenance of motoneuron firing, and thus muscular force. However, there is a lack of data describing the effects of fatiguing exercise on PIC activity in humans. We simultaneously applied tendon vibration and neuromuscular electrical stimulation (VibStim) before and after fatiguing exercise. VibStim induces self-sustained muscle activity that is proposed to result from PIC activation. Methods: Twelve men performed 5-s maximal isometric plantar flexor contractions (MVC) with 5-s rests until joint torque was reduced to 70%MVC. VibStim trials consisted of five 2-s trains of neuromuscular electrical stimulation (20 …
Fatigue Does Not Increase Limb Asymmetry Or Induce Proximal Joint Power Shift In Habitual, Multi-Speed Runners, Shayne Vial, Jodie Cochrane Wilkie, Mitchell Turner, Anthony J. Blazevich
Fatigue Does Not Increase Limb Asymmetry Or Induce Proximal Joint Power Shift In Habitual, Multi-Speed Runners, Shayne Vial, Jodie Cochrane Wilkie, Mitchell Turner, Anthony J. Blazevich
Research outputs 2022 to 2026
During prolonged jogging, joint moment and work tend to decrease in the distal (ankle) joint but increase at proximal (hip/knee) joints as performance fatigue manifests, and such adaptations might be expected to occur in sprinting. Fatigue is also thought to increase inter-limb asymmetries, which is speculated to influence injury risk. However, the effects of fatigue on sprint running gait have been incompletely studied, so these hypotheses remain untested. Using statistical parametric mapping, we compared 3-D kinematics and ground reaction force production between the dominant (DL) and non-dominant (NDL) legs of 13 soccer players during both non-fatigued and fatigued sprint running. …
Perceptions Of Capacity, Fatigue, And Their Psychophysics: Examining Construct Equivalence And The Relationship Between Actual Capacity And Perception Of Capacity During Resisted Elbow Flexion Tasks, James Steele, Matheus D. Pinto, Kazunori Nosaka, James L. Nuzzo
Perceptions Of Capacity, Fatigue, And Their Psychophysics: Examining Construct Equivalence And The Relationship Between Actual Capacity And Perception Of Capacity During Resisted Elbow Flexion Tasks, James Steele, Matheus D. Pinto, Kazunori Nosaka, James L. Nuzzo
Research outputs 2022 to 2026
The actual capacity to perform tasks, and actual fatigue, are concepts that have been thought of as inherently linked. These considerations also extend to their phenomenology, meaning the perception(s) of capacity or fatigue. The phenomenology of capacity or fatigue thus may be capturing the same underlying latent construct. Further, it is speculated that the actual capacity of a person to perform a given task, and their perception of that capacity, have a psychophysical relationship. The aim of this study was therefore twofold: 1) to explore the extensional equivalence of perceptions of capacity and fatigue, and 2) to explore the relationship …
Does Fatigue Influence Joint-Specific Work And Ground Force Production During The First Steps Of Maximal Acceleration?, Shayne Vial, Jodie C. Wilkie, Mitchell Turner, Mark Scanlan, Anthony J. Blazevich
Does Fatigue Influence Joint-Specific Work And Ground Force Production During The First Steps Of Maximal Acceleration?, Shayne Vial, Jodie C. Wilkie, Mitchell Turner, Mark Scanlan, Anthony J. Blazevich
Research outputs 2022 to 2026
During initial acceleration, the first steps of a maximal-effort (sprint) run often determine success or failure in the capture and evasion of an opponent, and is therefore a vital factor of success in many modern sports. However, accelerative events are commonly performed after having already run considerable distances, and the associated fatigue should impair muscle force production and thus reduce acceleration. Despite this, the effects of running-induced fatigue on our ability to accelerate as well as the running technique used to achieve it have received little attention. We recorded 3-D kinematics and ground reaction forces during the first three steps …
Study Protocol: Investigating The Feasibility Of A Hybrid Delivery Of Home-Based Cluster Set Resistance Training For Individuals Previously Treated For Lung Cancer, C. M. Fairman, O. L. Owens, Kristina L. Kendall, J. Steele, Christopher Latella, M. T. Jones, L. Marcotte, Carolyn M. J. Peddle-Mcintyre, K. K. Mcdonnell
Study Protocol: Investigating The Feasibility Of A Hybrid Delivery Of Home-Based Cluster Set Resistance Training For Individuals Previously Treated For Lung Cancer, C. M. Fairman, O. L. Owens, Kristina L. Kendall, J. Steele, Christopher Latella, M. T. Jones, L. Marcotte, Carolyn M. J. Peddle-Mcintyre, K. K. Mcdonnell
Research outputs 2022 to 2026
Background: Symptom burden remains a critical concern for individuals with non-small cell lung cancer (NSCLC) following the completion of treatment. The most common symptom clusters, dyspnea (shortness of breath) and fatigue, can contribute to physical decline, reductions in quality of life, and a higher risk of comorbidities and mortality. Dyspnea is a primary limiter of exercise capacity in individuals with lung cancer, resulting in exercise avoidance and an accelerated physical decline. As such, designing resistance training with cluster sets to mitigate symptoms of dyspnea and fatigue may result in improved exercise tolerance. Thus, maintaining the exercise stimulus via cluster sets, …
Voluntary Activation Of Muscle In Humans: Does Serotonergic Neuromodulation Matter?, Justin J. Kavanagh, Janet L. Taylor
Voluntary Activation Of Muscle In Humans: Does Serotonergic Neuromodulation Matter?, Justin J. Kavanagh, Janet L. Taylor
Research outputs 2022 to 2026
Ionotropic inputs to motoneurones have the capacity to depolarise and hyperpolarise the motoneurone, whereas neuromodulatory inputs control the state of excitability of the motoneurone. Intracellular recordings of motoneurones from in vitro and in situ animal preparations have provided extraordinary insight into the mechanisms that underpin how neuromodulators regulate neuronal excitability. However, far fewer studies have attempted to translate the findings from cellular and molecular studies into a human model. In this review, we focus on the role that serotonin (5-HT) plays in muscle activation in humans. 5-HT is a potent regulator of neuronal firing rates, which can influence the force …